I would pay $4k for a nice example. FYI my 92 with about the same mileage has original tranny in excellent condition....BUT, even as we speak, is having to get the head gasket replaced. Ug. You could use my story as leverage in your negotiations.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife